00280nam a2200121Ia 4500008004100000100001800041245003600059260001900095300000800114650001200122942000700134999001700141190216s9999||||xx |||||||||||||| ||und||  aLonghurst R S 0aGeometrical And Physical Optics  bOrient Longman  a657  aPhysics  cBK  c34148d34148